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What is a light bulb?

What is a light bulb? Here are some definitions.

Noun
  1. An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
  2. (by extension) An article that resembles such a bulb and converts electricity to light by any process.
  3. (figuratively) Used in reference to the sudden arrival of a realization, an inspiration, an idea, or the like.
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Examples
As you know from replacing light bulbs, there is a large, thin, frosted glass envelope in the familiar light bulb shape.
An incandescent light bulb contains a thin wire filament that glows hot when an electric current is run through it.
Lewis Latimer, the son of runaway slaves, became an electrical engineer and invented an inexpensive process for making light bulb filaments.
There's a light bulb glowing over my head that is brighter than the flaring of a sour gas well.
Some scientific breakthroughs, like Edison's invention of the light bulb, are purposeful and planned.
Don't embark on any ambitious DIY projects until you have seen how much mess he makes changing a light bulb.

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